[Sommelier] Correct syntax error (#4415)

packages/sommelier.rb

@@ -3,7 +3,7 @@ require 'package'
 class Sommelier < Package
   description 'Sommelier works by redirecting X11 and Wayland programs to the built-in ChromeOS wayland server.'
   homepage 'https://chromium.googlesource.com/chromiumos/containers/sommelier'
-  version '1382ce084cc407'
+  version '1382ce084cc408'
   compatibility 'all'
   source_url 'https://chromium.googlesource.com/chromiumos/containers/sommelier/+/0.20/README?format=TEXT'
   source_sha256 'b58d799b16d20abf92369fe0749c73f7398996f0afa9933517051778a8bb16c3'
@@ -48,7 +48,7 @@ class Sommelier < Package
       system "echo 'SOMM=\$(pidof sommelier 2> /dev/null)' >> stopsommelier"
       system "echo 'if [ ! -z \"\$SOMM\" ]; then' >> stopsommelier"
       system "echo '  killall -g sommelier' >> stopsommelier"
-      system "echo '  if pgrep "Xwayland"; then killall Xwayland; fi"
+      system "echo '  if pgrep \"Xwayland\"; then killall Xwayland; fi'"
       system "echo '  sleep 3' >> stopsommelier"
       system "echo 'fi' >> stopsommelier"
       system "echo 'SOMM=\$(pidof sommelier 2> /dev/null)' >> stopsommelier"